That's weird, I've heard Americans use both many times. Heard "on accident" just a few days ago. Maybe they are area dependent? (That person was in San Francisco.) Or slang?
How about "write me"? That's maybe a more common version of it that I've heard, as in "Don't forget to write me".
1) I am writing to my friend.
2. I dropped my phone by accident
How about "write me"? That's maybe a more common version of it that I've heard, as in "Don't forget to write me".